System Tests: Notes
CAUTION:
When battery or ECM is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until adaptation systems have completed a relearn cycle. See COMPUTER RELEARN PROCEDURES - IMPORT
article in GENERAL INFORMATION before disconnecting battery.
NOTE:
Before replacing any component that scan tool suggests are faulty. Ensure that all wiring connections and harness connectors are okay. Ensure that power and ground circuits are functioning properly. To identify ECM terminals referenced in testing, see PIN VOLTAGE/CIRCUIT RESISTANCE CHARTS
article. To identify circuits and wire colors referenced in testing, see WIRING DIAGRAMS
article.
SYMPTOM INDEX
| Symptom | Perform Test |
|---|---|
| Malfunction Indicator Light Inoperative | A1 |
| Malfunction Indicator Light Remains On | A2 |
| Engine Control Module Power & Ground Circuit Check | A3 |
| Engine System Check | A4 |